The majority of (American) people during WW2 were in favour of putting Japanese-Americans on the west coast into internment camps.

That was a decision by the military and approved by FDR. SOME of the people supported it but many did not. Some used it as a way to grab farms and businesses, just as some got into the black market and war profiteering. Most did not.

I know some Japanese-Americans who were interned and they will tell you that many of their neighbors thought it unfair and "stupid."

Ask yourself why the Japanese-Americans in Hawai'i were not interned, and yet post-war investigations showed that there were actually Japanese spies active there.

This was another case of ignorance used for political (and sometimes economic) ends.